Oil-engine scavenging pump



O. E. JORGENSEN OIL ENGINE scAvENcTING PUMP Filed Nov. 14, 1921 2 'sheetS-sheet l E E E 'Ln um" u nr1 u u umn u umn HT] L j 2 sheets-sheet 2 O. E JORGENSEN OIL ENGINE SCAVENGING PUMP Filed Nov'.

OLAV ESKIL JORGENSEN, 0F NEW YORK, No Y., ASSIG-NOR TO WORTHINGION' PUMP AND MACHINERY CORPORATION, OE' NEW YORK, N. Y., A CORPORATION OF VIR- GLN'IA.

'OIL-ENGINE SCAVENGING PUMP.

Application filed November 14, 182i. Serial No. 514,848.

To aZZ 'whom 'it may concern:

Be it known that l, OLAV ESKIL JoRGnN- SEN, a subject of the King of Denmark, residing at New York, county of Queens, and

State of New York, have invented certain` new and useful Improvements in Oil-,Engine .Scavenging Pumps, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to improvements in scavenging pumps for internal combustion engines and particularly for engines of the Diesel type.

The object of the invention is to provide a compact, rigid and durable Vconstruction which can be readily machined so as to give y the required accuracy of parts, and which will permit ready and quick access to all the parts for purposes of adjustment and repair.

With these general objects in View, the in vention consists in the features, details'voi construction and combination of parts which will first be described in connection with the accompanying drawings and then more pan ticularly pointed out.

`In the drawings,-

Fig. 1 is a diagrammatic end elevation,

y partly broken away, of a Diesel double-acting, two-cycle engine showing the new pump in place thereon;

Fig. 2 is a diagrammatic side elevation of the engine with 4 engine cylinders with the new pump in place;

Fig. 3 isa vertical section through the center of the air-pump in a plane in which lies the main shaft of the engine;

Fig. 4 is a similar view at right angles to Fig. 3;.and

Figs. 5, 6, 7 and 8 are horizontal sectional views on the lines55; 6 6; 7--7 and 8- of Figs.. 3 and 4.

Fig9 is a detail view of one of the valves, shown as a suction valve, which will be reversed for a discharge valve.

Referring-to the drawings, and particu-4 larly to Figs. 1 and 2, A is a cylinder-base suitably supported `on any suitable engine frame, such as is indicated at B.

. In the particular engine construction illustrated in the drawings, each engine unit is of the double-acting, two-cycle, Diesel'type, comprising a top cylinder C and a bottom cylinder (1 these cylinders being carried by' the cylinder-base A. The engine has a main crank shaft D arranged to be driven in the usual way by suitable connecting rods, not shown.

rlhe scavenging air pump which forms the subject matter of the present invention comprises two air pumps in line with each other and having their two pistonslmounted on a common piston rod, each air pump being a double-acting pump. Referring to Fig. 3, E is the cylinder of the upper air pump, and El the cylinder of the lower air-pump. F is the upper piston, F1 the lower piston, and G thepiston rod connected to both pistons. H is the upper cylinder head, H1 the lower cylinder head and H2 an intermediate head common to both cylinders.

The intermediate head H2 is iianged and is tted into va seat formed in a septum or horizontal partition a, Fig. 4, which constitutes a part-of the cylinder base A, the partition. a having a horizontal flange al and a vertical annular flange a, at the seat. The intermediate head H, is secured in its seat in any suitable way as, for example, by machine screws l which are accessible from the upper side of the cylinder base when the upper air pump is removed. v

rlhe upper cylinder E is provided with a corresponding hole in the upper member or plate ci, of the cylinder base and having a yflange el, overhanging said plate a3, to which it may be secured in any suitable way, as, for example, by machine screws, as indicated at 2, Fig. 3. The cylinder E is of such length that its lowerend reaches nearly but not quite to the upper surface of the intermediate head H2, whereby a suitable passage or port for the entrance and discharge of air beneath the upper piston F is provided all around the cylinder, this opening leading into an upper chamber or space l formed in the cylinder base above the septumua. The lower cylinder is similarly constructed and mounted in the cylinder base,`being inserted into the cylinder base from below. upward and held in placeby the machine screws 3. Its upper edge extends nearly but not quite lto the lower surface of the intermediate head l-I2 so as to leave an air passage or port all around the cylinder whereby the 'space in the lower cylinder above the piston F, lis put lAld . andeach has, twoV sets of valves. "offsuction valves are indicated at L1, L2. and the sets ot discharge valves at M1, M2 respectively.' While any suitable valves may in communication with a lower chamber or spacell, Fig. 4, formed in the cylinder base below theseptum a.

The side walls of the cylinder baseare provided with openings leading from the `upper and lower chambers I, 1 respec tively, to a suction valve chest K, and corresponding openings leading to a discharge valve chest Kr These valve chests are secured to opposite vsides of the cylinder base The sets be employed, those indicated are of the plate spring variety, for example, such as are fully disclosed in Patent No. 1,341,145, `dated May 235, 1920. One advantage of such valves is that the whole valve device may be kept i on the outside ot the respective valve chambeuandthere'fore is readily removable. lf

the'valve device of Patent 1,341,145 is secured with its valve seat outward and its cap` or abutment next to the wall ot the valvel chamber 1,'the `valve serves as a suction valve, whereas ifthe seat is next to the wall of the valve. chamber and the Cap or abutment isoutward, the valve serves as adischarge valve.

The upper end of the cylinder E is con- 'nected by' a suitable passage N .with the chamber I, below the diaphragm a, the passage N'opening into the top of the cylinder,

as will be clear trom F ig.v 3. The lower v'endof the cylinder E, is connected, by a passage N1, with the chamber l above t-he the cylinder base is enclosed by a wall n.

ingy rod P, and cross-head Q running in' guides R.

VThe operation of the air pump is as tol- The piston rod G is reciprocated in any suitable way from the main shaft D, kas, for example, through a crank 0, connectlows:v Assuming the pistons F, F, at the bottoms of their respective cylinders as shown in Fig. 3, it is clear that as they go upward, the air vabove each piston'will be compressed. The air will be forcedV from ,the upper end of the cylinder E, directly into the spacel1 andthe air from the up- 'Alper end of the cylinder E will also be forced into the space L through the passage N.

The suction'valves L2 will close and the ldischarge valves M2 will"openthus allowing the compressed air to escape to the dis- At the same time pthe' upward movement of the pistons F,

Flfwill'c'ause a suction beneath each piston, thereby tending to draw air into `the,

lower end ot the cylinder E directly from the chamber l, and f'to draw air into the lower end of the cylinder El, from the chamber I, through the passage N1. Hence the discharge valvesfMlwilll'close andthe f )suction valves L, will opensc thatthe cylinders 'may till with air below Y`their respective pistons. i. On the reversal ot the pistons,

the air beneath the pistons will be driven lout into the chamber l, thus closing the suc- `the pistons, a suction will be created above each piston, therebydrawing air fromthe chamber Il, which causes the'A discharge valves M2 toclose and the* suction valves L, to open. In. this way a continuous discharge ofair` lto thedischarge valve-chest K, takes place.. From this chest the air is led by a suitable main'conduit S tothe scavenging air inletsoi the Irespective engines. lFach enginetakes its supply from the main conduitS through a suitable elbow connection which connects themain conduit with suitable scavenging air-inlets formed in the cylinder base, one inlet for each engine.` f l ln the preferred'construction ol the engine and pump,.the cylinder base A is held .to the `frame B by long'bolts which pass from the enginebase through the cylinder base. Some of these bolts are indicated in cross section at l), b, Figs. 5 and 6.

lt is to be understood `that the pistons of the air-pump may have suitable packing rings, but as these are well known they have not been illustrated. Furthermore, any suitable means for packing the piston-rod where it passes through the lower head Hl and the intermediatehead H, may be employed. ConventionalV "representations of such packing devices 'areindicated at g1 and g2, respectively. y

The construction described isl particularly advantageous, because ot the accessibility of the'hvalves andthe readiness with which the parts may be disassembled and reassembled.y For example, by removingthe respective covers of the valve chests, the valves may be reached readily and conveniently. Ey loosening the machine screws 2 the upper cylinder may be lifted off and access obtained to the upper piston vand-ther packing gland carried by theintermediate head H2. Gr by removing the machine screws 3, the lower cylindermayjbe let down topermit `access .to the lower piston. ln case ot' necessity, the `upper cylinderimay 4be removed, then the intermediate head H2 untastened and lifted out through the top, to gether lwith the two pistons, by disconnecting the piston rod vatthe cross head.

' These features are particularly important in marineengines where repairs or adjustment sometimes must y,be Amade lduring heavy lOO `weather and with a pitching and rolling ship, and must be done as quickly as possible.

What is claimed is:

l. The combination with two double-acting cylinders in line with each other, a piston in each cylinder, a piston rod com` mon to both pistons and means for reciprocating the piston rod, of a cylinder-base arranged tosupport both cylinders, said cylinder-base having an upper chamber in communication with the lower ends of each cylinder, and comprising passages opening at opposite sides of the cylinderbase,"the cylinder-base also having a lower chamber in communication with the upper ends oi both cylinders and comprising suction and discharge passages opening at opposite sides of the cylinder-base, suction valves located at one side of the cylinder base and independently controlling the suction passages to the upper and lower chambers, re-

spectively, discharge valves located on the side of the cylinder-base opposite the suction valves and independently controlling the discharge passages of the upper and lower chambers, respectively, and valve chests secured to opposite sides of the cylinder-base and enclosing the respective valves.

2. l'n an air-pump, the combination, with a cylinder-base and means for supporting the' same, said cylinder-base having an upper and a lower chamber separated from each other, each chamber having a suction passage and a discharge passage opening at opposite sides of the cylinder-base, valve mechanism at the outer ends of the respective passages, of valve chests secured to the cylinder-base and enclosing the respective valves, an intermediate head carried by the cylinder-base, an upper cylinder and a lower cylinder supported by the cylinder-base, heads for said cylinders, a! piston rod passing through the lower head and through the intermediate head, a piston in each cylinder secured to the piston rod, the upper end of the lower cylinder being in direct communication with the lower chamber in the cylinder-base, the lower end of the upper cylinder being in direct communication with the upper chamber in the cylinder-base, the upper end of the upper cylinder being in communication with the lower chamber in the cylinder-base through a passage, the lower end of the lower cylinder being in communication with the upper chamber in the cylinder-base through a passage, and means for reciprocating the piston rod. f

8. In an air-pump, the combination, with a cylinder-base and means for supporting the same, said cylinder-base having an upper and a lower chamber separated from each other, each chamber having a suction passage and a discharge passage opening at opposite sides of the cylinder-base, valve mechanism at the outer ends of the respective passages, or' valve chests secured to the cylinder-base and enclosing the respective valves, an intermediate head carried by the cylinder-base, an upper cylinder and a lower cylinder supported by the cylinder-base, heads for said cylinders, a piston rod passing through the lower head and through the intermediate head, a piston in each cylinder secured to the piston rod, the upper end of the lower cylinder being in direct communication with the lower chamber in the cylinder-base, the lower end of the upper cylinder being in direct communication with the upper chamber in the cylinder-base, the upper end of the upper cylinder being in communication with the lower chamber in the cylinder-base through a pas-sage, part of which is formed in the wall of the upper cylinder and the remainder in the cylinder-base, the lower end of the lower cylinder being in communication with the upper chamber in the cylinderbase through a passage, part of which is formed in the wall of the lower cylinder and the remainder in the cylinder-base, and means for reciprocating the piston rod.

4C. In an air-pump, the combination, with a cylinder-base having an upper and a lower chamber separated by a septum having an opening, each of said chambers including a suction passage and a discharge passage, said passages opening at opposite sides of the `cylinder-base, said cylinder-base also having cylinder receiving openings in its upper and lower walls, an intermediate head, removably secured in the opening in the septum of the cylinder-base and removable through the cylinder-receiving opening of the upper wall of the cylinder-base, cylinders projecting into the cylinder receiving opening of the cylinder-base and secured to the upper andlower walls thereon, respectively, suction and discharge valve mechanisms for the corresponding passagesy of the cylinder-base, a suction valve chest secured to one side of the cylinder-base and enclosing both suction valve mechanisms, a discharge valve chest secured to the opposite side of the cylinder-base and enclosing both discharge valve mechanisms, heads for the cylinders, a piston in each cylinder, a piston-rod extending through the lower cylinder head and through the intermediate head and carrying both pistons, and means for reciprocating theV piston-rod.

1n testimony whereof, I have hereunto set my hand.

@LAV ESKIL JORGENSEN. 

